DNS Cache Flush, Clear, or Reset in Vista, Windows 7, and Windows 8.
Frequently web connection problems can be traced to a corrupted DNS cache. Flushing this cache is an easy fix to many of these problems. This is how to flush the cache in Vista, Windows 7, and Windows 8.
Here is how to fix that corrupted DNS cache.
1. Click the Microsoft Vista Start logo in the bottom left corner of the screen
2. Click All Programs
3. Click Accessories
4. RIGHT-click on Command Prompt
5. Select Run As Administrator
6. In the command window type the following and then hit enter: ipconfig /flushdns
7. You will see the following confirmation:
Windows IP Configuration Successfully flushed the DNS Resolver Cache.